77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
|
#include <avr/interrupt.h>
|
||
|
|
#include <avr/pgmspace.h>
|
||
|
|
#include "usb_keyboard.h"
|
||
|
|
|
||
|
|
|
||
|
|
// which modifier keys are currently pressed
|
||
|
|
// 1=left ctrl, 2=left shift, 4=left alt, 8=left gui
|
||
|
|
// 16=right ctrl, 32=right shift, 64=right alt, 128=right gui
|
||
|
|
uint8_t keyboard_modifier_keys=0;
|
||
|
|
|
||
|
|
// which keys are currently pressed, up to 6 keys may be down at once
|
||
|
|
uint8_t keyboard_keys[6]={0,0,0,0,0,0};
|
||
|
|
|
||
|
|
// protocol setting from the host. We use exactly the same report
|
||
|
|
// either way, so this variable only stores the setting since we
|
||
|
|
// are required to be able to report which setting is in use.
|
||
|
|
uint8_t keyboard_protocol=1;
|
||
|
|
|
||
|
|
// the idle configuration, how often we send the report to the
|
||
|
|
// host (ms * 4) even when it hasn't changed
|
||
|
|
uint8_t keyboard_idle_config=125;
|
||
|
|
|
||
|
|
// count until idle timeout
|
||
|
|
uint8_t keyboard_idle_count=0;
|
||
|
|
|
||
|
|
// 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
|
||
|
|
volatile uint8_t keyboard_leds=0;
|
||
|
|
|
||
|
|
|
||
|
|
// perform a single keystroke
|
||
|
|
int8_t usb_keyboard_press(uint8_t key, uint8_t modifier)
|
||
|
|
{
|
||
|
|
int8_t r;
|
||
|
|
|
||
|
|
keyboard_modifier_keys = modifier;
|
||
|
|
keyboard_keys[0] = key;
|
||
|
|
r = usb_keyboard_send();
|
||
|
|
if (r) return r;
|
||
|
|
keyboard_modifier_keys = 0;
|
||
|
|
keyboard_keys[0] = 0;
|
||
|
|
return usb_keyboard_send();
|
||
|
|
}
|
||
|
|
|
||
|
|
// send the contents of keyboard_keys and keyboard_modifier_keys
|
||
|
|
int8_t usb_keyboard_send(void)
|
||
|
|
{
|
||
|
|
uint8_t i, intr_state, timeout;
|
||
|
|
|
||
|
|
if (!usb_configured()) return -1;
|
||
|
|
intr_state = SREG;
|
||
|
|
cli();
|
||
|
|
UENUM = KEYBOARD_ENDPOINT;
|
||
|
|
timeout = UDFNUML + 50;
|
||
|
|
while (1) {
|
||
|
|
// are we ready to transmit?
|
||
|
|
if (UEINTX & (1<<RWAL)) break;
|
||
|
|
SREG = intr_state;
|
||
|
|
// has the USB gone offline?
|
||
|
|
if (!usb_configured()) return -1;
|
||
|
|
// have we waited too long?
|
||
|
|
if (UDFNUML == timeout) return -1;
|
||
|
|
// get ready to try checking again
|
||
|
|
intr_state = SREG;
|
||
|
|
cli();
|
||
|
|
UENUM = KEYBOARD_ENDPOINT;
|
||
|
|
}
|
||
|
|
UEDATX = keyboard_modifier_keys;
|
||
|
|
UEDATX = 0;
|
||
|
|
for (i=0; i<6; i++) {
|
||
|
|
UEDATX = keyboard_keys[i];
|
||
|
|
}
|
||
|
|
UEINTX = 0x3A;
|
||
|
|
keyboard_idle_count = 0;
|
||
|
|
SREG = intr_state;
|
||
|
|
return 0;
|
||
|
|
}
|